Connected: An Internet Encyclopedia
RFC 1123 - 5.3.1.2 Receiving strategy

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### 5.3.1.2 Receiving strategy

The receiver-SMTP SHOULD attempt to keep a pending listen on the SMTP port at all times. This will require the support of multiple incoming TCP connections for SMTP. Some limit MAY be imposed.

IMPLEMENTATION:

  When the receiver-SMTP receives mail from a particular host address, it could notify the sender-SMTP to retry any mail pending for that host address.

Next: 5.3.2 Timeouts in SMTP

Connected: An Internet Encyclopedia
RFC 1123 - 5.3.1.2 Receiving strategy